121420336865 has 4 divisors (see below), whose sum is σ = 145704404244. Its totient is φ = 97136269488.

The previous prime is 121420336859. The next prime is 121420336867. The reversal of 121420336865 is 568633024121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568633024121 = 21481 ⋅26471441.

It can be written as a sum of positive squares in 2 ways, for example, as 52806201616 + 68614135249 = 229796^2 + 261943^2 .

It is a cyclic number.

It is not a de Polignac number, because 121420336865 - 2³⁶ = 52700860129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121420336867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12142033682 + ... + 12142033691.

It is an arithmetic number, because the mean of its divisors is an integer number (36426101061).

Almost surely, 2^121420336865 is an apocalyptic number.

It is an amenable number.

121420336865 is a deficient number, since it is larger than the sum of its proper divisors (24284067379).

121420336865 is an equidigital number, since it uses as much as digits as its factorization.

121420336865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24284067378.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 121420336865 in words is "one hundred twenty-one billion, four hundred twenty million, three hundred thirty-six thousand, eight hundred sixty-five".